How is Snowball demonized after the windmill is destroyed?

Even though the windmill was destroyed by natural causes, Napoleon blames Snowball for its destruction and sentences him to death. Napoleon also offers half a bushel of apples and the title of “Animal Hero, Second Class” to any animal that detains him. There is a track of pig footprints leading to the hedge, which Napoleon attributes to Snowball. Then Napoleon rouses the animals to action, saying, “Forward, comrades! Long live the windmill! Long live Animal Farm!” (83).